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A 3D C/SiC composite and a bulk CVD SiC material were prepared. The effects of the CVD SiC coating and the heat treatment on the longitudinal and transverse thermal diffusivity of the C/SiC composites were investigated. The thermal diffusivity of the C/SiC composites could be well fitted by a multinomial function from room temperature to 1400 o C which includes a power term, an exponential...
The thermal shock behavior of a three-dimensional carbon fiber reinforced SiC matrix fabricated by chemical vapor infiltration (CVI) technique was studied using the air quenched method. Damage to composites was assessed by a destructive technique of measuring mechanical properties using three-point flexure and SEM characterization. C/SiC composites displayed good resistance to thermal shock, and retained...
Corrosion behavior of the three-dimensional C/SiC composite was investigated in a Na 2 SO 4 vapor environment at temperatures from 1000 to 1500 o C. The degradation mechanisms for the C/SiC composite could be determined by dividing a complicated function describing the weight change of the composite with temperature into several monotone functions describing the mechanisms,...
Two kinds of multi-layer CVD SiC coatings were prepared on a three-dimensional C/SiC composite. Oxidation behavior of the coating and the composite were studied and the effect of defects in the coating on its oxidation protection property were investigated. Above 1200 o C, thickness of the oxide film formed on the coating was related to oxidation time by the Fick's first law X(t) 2 ...
A borosilicate glass which consisted of 40-45 mol.% B 2 O 3 and 55-60 mol.% SiO 2 was used as a sealant for the C/SiC composites with and without a Si-Zr coating, and the oxidation behavior of the C/SiC composites in air was investigated. The glass increased greatly the oxidation resistance by decreasing the maximum weight loss and the cracking temperature range below 1000...
A three dimensional C/SiC composite was prepared and flexural strengths during combustion atmosphere and weight changes in air were investigated. When oxidized in air, the C/SiC composite gained weight above the cracking temperature, and lost weight below the cracking temperature. The weight loss reached its maxumum value at about 700 o C. When oxidized during combustion atmosphere, the composite...
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